Safety attachment for hoisting-engines.



PATENTED NOV. 15, 1904. F. W. LYON. SAFETY ATTACHMENT FOR HOISTINGENGINES.

APPLICATION FILED APR 4. 1904.

ZSHEETS-SHEET 1.

N0 MODEL.

m w a $1 Witnesses Fltkomegs No. 774,767. PATENTED NOV. 15, 1904. F. W.LYON.

SAFETY ATTACHMENT FOR HOISTING ENGINES.

APPLICATION FILED AER. 4, 1904.

- N0 MODEL. 2 SHEETS-SHEET 2.

Htcomegs Patented November 15, 1904. 7

UNITED STATES PATENT OEEIcE.

FRED W. LYON, OF GRAND JUNCTION, COLORADO.

SAFETY ATTACHMENT FOR HOlSTlNG-ENGINES.

SPECIFICATION forming part of Letters Patent No. 774,767, dated November15, 1904.

Application filed April 4, i904. Serial No. 201,569. (No model.) I I Toall whom it may concern:

Be it known that I, FRED W. LYON, a citizen of the United States,residing at Grand J unction, in the county of Mesa and State ofColorado, have invented a new and useful Safety Attachment forHoisting-Engines, of which the following is a specification.

This invention relates to improvements in safety attachments forhoisting-engines, and has for its principal object to provide a meansfor stopping the movement of a drum or other winding element when thehoisting rope or cable has been wound .or unwound to a predeterminedextent, the device, while capable of general use, being of especialvalue in connection with elevators and serving as an automatic means forstopping the car at the upper and lower limits of its travel should theattendant neglect to operate the controlling means.

A further object of the invention is to provide a device of this classwhich may be adjusted for use in connection with drums of any capacityand applied at comparatively small expense to hoisting mechanismsalready in use.

A still further object of the invention is to provide a safety device inwhich at either limit of winding or unwinding movement the power will beinstantly shut off and a brake will be simultaneously applied to thewinding-drum in order to stop or check its movement.

With these and other objects in view, as will more fully hereinafterappear, the'invention consists in the novel construction and arrangement of parts hereinafter fully described, illus trated in theaccompanying drawings, and particularly pointed out in the appendedclaims, it being understood that various changes in the form,proportions, size, and minor details of the structure may be madewithout departing from the spirit or sacrificing any of the advantagesofthe invention.

In the accompanying drawings, Figure 1 is a plan view, partly in thenature of a diagram, illustrating the safety attachment forhoisting-machines constructed in accordance with the invention. Fig. 2is a plan View of the valve-actuating device which receives motion fromthe hoisting-drum. Fig. 3 is a plan view of the same. Fig. 4 is atransverse sectional elevation of a portion of the device on the line t4 of Fig. 2. Fig. 5 is a detail view illustrating the form of brakewhich may be used for the hoisting-drum.

Similar numerals of reference are employed to indicate correspondingparts throughout the several figures of the drawings.

The safety device may be employed in connection with hoisting mechanismsof any class, including those in which a drum is used to receive a cableor rope that is connected to the object to be raised and lowered as wellas mechanisms where the hoisting is accomplished by the separation oftwo or more sets of grooved drums around which the cable or cables arepassed. and in the present instance the winding-drum 1 must beconsidered as typical of a hoisting mechanism of any desiredconstruction. The main shaft 2 of the hoisting-drum may be connected toany suitable operating mechanismas, for instance, a steam-engine, whichis supplied with steam or other actuating fluid by means of a pipe 4,having a gate-valve 5, which is automatically closed in order to cut ofithe supply of steam at the completion of the winding or unwindingoperation.

J ournaled in a suitable supporting-frame 6 is a shaft 7, threadedthroughout the greater portion of its length and extending through athreaded opening in a nut 8, having a depending tongue 9, adapted to agroove 10, formed in the frame, the tongue serving by engagement withthe walls of the groove to prevent turning movement of the nut with thescrew. At one end of the screw-shaft 7 is a bevel-gear 11, intermeshingwith a small bevel-gear 12 on a shaft 13, that carries a spur-gear 14,intermeshing with a pinion 15 on the shaft 2, or otherwiseconnected tothe shaft in such manner that the rotative movement of the drum will beimparted to the screw-shaft, and the nut 8 will be moved longitudinallythereof. The opposite end members of the frame are provided withguidingopenings for the passage of a pair of parallel rods 16 and 17,disposed one on each side of the screw-shaft, and the nut is likewiseprovided with suitable openings 18 for the passage of these rods, therods serving as an additional means for preventing rotative movement ofthe nut. At one end of the frame is a lug or bracket 21, to which ispivoted a le- Ver 22, having one of its ends connected to the rod 16 andits opposite end to the rod 17, and both rods are secured totappet-blocks 2 1, which may be adjusted to any desired position on therods, the engagement of the nut with the tappets serving to shift therods longitudinally.

At a point adjacent to the end of the rod 17 is a fluid-pressure-supplypipe 26, containing a valve 27, that is connected to the rod 17 andunder normal conditions the pressure of the fluid being exerted in thedirection of the arrow will serve tomaintain the valve in closedposition; but when either of the tappets is engaged by the nut the valvewill be opened and the fluid allowed to pass to a second pipe 28. Theopposite ends of the pipe 28 communicate, respectively, with cylinders29 and 30. In the cylinder 29 is a plunger 31, connected by a rod 32 tothe gate-valve 5, so that when the fluid-pressure is allowed to operateon the plunger 31 the valve will be moved to closed position and thesupply of steam or other fluid to the winding-engine will be instantlycut off. In the cylinder 30 is a plunger 33, connected by a rod 34 to abrake mechanism, which serves to press the brake shoes 36 against afriction wheel or disk carried by and connected to the winding-drum andserving to stop or check the movement of the winding-drum as soon as theplunger is moved outward.

1n the operation of the device the tappetblocks 2 1 are adjusted to theproper position in accordance with the capacity of the winding-drum andthe length of the cable or rope to be wound thereon. During the movementof the elevator or other device and the winding or unwinding of the drumthe shaft 7 will be turned in one direction or the other and will movethe nut 8 between the tappets. When the nut engages either one of thetappets, the valve 27 will open and allow the fluid-pressure to pass tothe cylinders 29 and 30 and result in the cutting off of the supply ofoperating fluid and the application of the brake hereinbefore described.

In some cases, where the pressure may not be suflicient to close thevalve 27, a collar 37 is secured on rod 17, and between this collar andthe adjacent portion of the frame is placed a compression-spring 38,which will serve to positively close the valve when the nut moves torelease position.

Having thus described the invention, what is claimed is 1. Thecombination with a hoisting mechanism, including an operating device, ofa screwshaft revoluble with the hoisting mechanism, a nut disposed onthe shaft and movable longitudinally thereof, means for holding the nutfrom revoluble movement, a pair of rods serving partly as guides for thenut, tappetblocks disposed in the path of movement of the nut, and ameans connected to the tappetblocks for cutting off the actuating mediumof the operating device.

2. The combination with a hoisting-drum, of an operating device for thedrum, a screwshaft, a nut mounted on the shaft and movablelongitudiually thereof, a pair of connected rods arranged parallel withthe shaft, tappet-blocks disposed on the rods and in the path ofmovement of the nut, and means connected to said rod for cutting off theactuating medium of the operating device.

3. The combination with a hoisting-drum, of an operating device, ascrew-shaft, gearing connections between the screw-shaft and thehoisting-drum, a nut carried by the shaft, a pair of parallel rodsdisposed one on each side of the shaft, a pivotally-mounted leverbetween the rods, tappet-blocks carried by said rods and adjustablethereon, a fluid-pressuresupply pipe leading to the operating device,and a valve controlled by said rods for cutting ofl the flow of fluid tosaid pipe.

4L. The combination with a hoisting-drum, of an engine, afluid-pressure-supply pipe connected thereto, a valve in said pipe, asecond pipe connected to a source of fluid-pressure, a cylinderconnected to said second pipe, a plunger disposed in the cylinder andconnected to the valve, a controlling-valve in said second pipe, andmeans controlled by the extent of movement of the winding-drum foropening said second valve.

5. The combination with a hoisting-drum, of an operating-engine,asteam-pipe connected thereto, a valve for said pipe, a second pipeconnected to a source of pressure-supply, a pair of cylinders connectedto the second pipe, plungers in said cylinders, one of said cylindersbeing connected to the valve of the steampipe, a hoisting-drum brakeoperatively connected to the second plunger, and means controlled by theextent of movement of the hoisting-drum for governing the How of fluidto said pipe.

6. The combination with a hoisting-drum, of a drum-operating engine, asteam-pipe connected thereto, a valve for said steam-pipe, a brake forthe drum, a pipe connected to a source of pressure-supply, acontrolling-valve in said pipe, a pair of cylinders connected to thesecond pipe, plungers in said cylinders, means for connecting one of theplungers to the steam-valve, means for connecting the second plunger tothe brake, a threaded shaft operatively connected to the hoisting-drum,a frame having bearings for the shaft, a nut carried by the shaft, andprovided with a tongue adapted to a groove in said frame, a pair of rodsarranged parallel With the shaft and ex- 1 In testimony that I claim theforegoing as tending through guide-openings in the frame my own I havehereto affixed my signature in and in the sides of the nut, apivota'lly-mountthe presence of two Witnesses.

ed lever connecting the rods, tappet-blocks FRED IV. LYON. adjustablymounted on the rod, and means for I Witnesses:

connecting one of said rods to said operating- 1 G. VAN HooREBEKE,

valve. i. J. S. (JARNAHAN.

